7 public questions tagged with this topic.
The reducing agent donates electrons. Mg (0) loses electrons to form Mg²⁺ (+2), reducing H+.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
Reaction: CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O. Moles of HCl = 2 × 0.05 = 0.1 mol. 0.1 mol HCl needs 0.05 mol CaCO₃ = 0.05 × 100 = 5 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Importance and Nature of Chemistry and Properties of Matter
Gastrin, secreted by the stomach, stimulates the release of hydrochloric acid and pepsinogen.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Endocrine Disorders
HCl is the correct answer as it accurately identifies the biological location, composition, or distribution described in this question. In Acid, Base, pH, the spatial organization and localization of molecules are critical to their function. HCl is specifically associated with the structure or compartment mentioned because of its unique biochemical properties and physiological role. The other options (H₂SO₄, HNO₃, and CH₃COOH) are primarily associated with different cellular compartments, tissues, or structural contexts.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2
2 accurately defines or describes the concept asked in this question. Within Acid, Base, pH, precise definitions and terminology are essential for clear scientific communication. The other options (1, 3, and 4) either describe related but distinct concepts, use incorrect terminology, or confuse similar-sounding terms that have different scientific meanings. A thorough understanding of exact definitions helps distinguish between closely related biological concepts and is crucial for competitive examinations.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2
6.96 accurately defines or describes the concept asked in this question. Within pH and Buffer, precise definitions and terminology are essential for clear scientific communication. The other options (7.04, 7, and 8) either describe related but distinct concepts, use incorrect terminology, or confuse similar-sounding terms that have different scientific meanings. A thorough understanding of exact definitions helps distinguish between closely related biological concepts and is crucial for competitive examinations.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2
HCl creates an acidic medium which facilitates the action of the enzyme pepsin in digesting proteins.
Ref: NCERT Text book class 10 Biology Chapter 5 life process
